Grape Pomace As Hog Feed

What is the value of grape pomace as a hog feed?

It has been sold for 50 cents a ton as it comes from the press at the
winery and when a person has not got any surplus of other feeds, it is
evidently worth that and then some. The only way to feed it is to put it
up in a big pile and let the hogs take it as they want it. It will help
keep them growing through the winter provided they have other feed with
it that might not be sufficient without the pomace.